Hurry plz
Heart is to the ________ system as lungs are to the _________ system
respiratory; endocrine
nervous; endocrine
endocrine; muscular
circulatory; respiratory
Which of the following could be compared to soldiers?
Question 3 options:
white blood cells
Your heart
red blood cells
Your lungs
Which system is responsible for the transportation of blood throughout the system?
Question 4 options:
respiratory system
circulatory system
endocrine system
digestive system